Concentration of the Ore - Free MCQ Practice Test with solutions, JEE Chemistry
MCQ Practice Test & Solutions: Test: Concentration of the Ore (20 Questions)
You can prepare effectively for JEE Chemistry for JEE Main & Advanced with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Concentration of the Ore". These 20 questions have been designed by the experts with the latest curriculum of JEE 2026, to help you master the concept.
Test Highlights:
- - Format: Multiple Choice Questions (MCQ)
- - Duration: 20 minutes
- - Number of Questions: 20
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Which of the following statements regarding metallurgy of iron is incorrect?
Detailed Solution: Question 1
carbon and impurities like 
Mn etc., in small amount.Detailed Solution: Question 2
Which of the following condition favours the reduction of a metal oxide to metal?
Detailed Solution: Question 3
In order to refine "blister copper" it is melted in a furnace and is stirred with green logs of wood. The purpose is
Detailed Solution: Question 4
Match the items of List-I with those of List-II and choose the correct option given below.
Detailed Solution: Question 5
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
Detailed Solution: Question 6
of most of the sulphides are greater than those of 
and 
, therefore neither 
nor 
can reduce metal sulphide to metal. Further, the standard free energies of formation of oxide are much less than those of 
. Hence oxidation of metal sulphides to metal oxide is thermodynamically favourable.Which one of the following is used to produce 
by electrolysis?
Detailed Solution: Question 7
as elecurolyse, carbon
or 
(cryolite or fluorspar), which lowers the melting point of alumina and brings conductivity.
At anode 
melt 
melt 
and 
. Hence, option (a) is the correct answer.Before introducing 
in blast furnace , it is converted to 
by roasting so that
Detailed Solution: Question 8
is capable forming slag with 
Identify the correct statements from the following:
i. In the extraction of 
and 
, zinc is used as reducing agent.
ii. Impure zinc can be refined by distillation method.
iii. Malachite is an ore of nickel.
i. In the extraction of
and , zinc is used as reducing agent.ii. Impure zinc can be refined by distillation method.
iii. Malachite is an ore of nickel.
Detailed Solution: Question 9
Detailed Solution: Question 10
When a metal is to be extracted from its ore and the gangue associated with the ore is silica, then
Detailed Solution: Question 11
Which of the following statements is not correct?
1. Reduction of alumina to give aluminium by magnesium is thermodynamically feasible.
2. The point of intersection of 
and 
curves in Ellingham diagram is below 
.
3. Use of magnesium as reducing agent in metallurgy of aluminium is economical.
4. Ellingham diagram represents the graphical plot of Gibbs energy vs temperature for the formation of the oxides of common metals and reducing agents.
Detailed Solution: Question 12
as reducing agent in metallurgy of aluminium 
is uneconomical. So, statement 3 is not correct.Which of the following examples is not correctly matched?
Detailed Solution: Question 13
and 
occur only in combined state, as these metals are available in nature mostly in the form of sulphide and oxides respectively.
and 
occur in both native and combined state.Froth floatation process is used for the metallurgy of
Detailed Solution: Question 14
Which of the following metal is leached by cyanide process
Detailed Solution: Question 15
Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?
Detailed Solution: Question 16
is an ore of silver. Silver is extracted from argentite by the mac-Arthur and Forest process (leaching process).
One of the processes used for concentration of ores is Froth floatation process. This process is generally used for concentration of sulphide ores. Sometimes in this process we add 
as a depressant. 
is generally added in case of 
and PbS minerals. What is the purpose of addition of NaCN during the process of Froth floatation ?
as a depressant. is generally added in case of and PbS minerals. What is the purpose of addition of NaCN during the process of Froth floatation ?Detailed Solution: Question 17
and due to this 
is prevented from the froth formation while PbS form froth.Which of the following statements is not correct?
(i) Froth-floatation is used for removing gangue from sulphide ore.
(ii) Cresols are used to stabilise the froth.
(iii) Sodium cyanide can be used as depressant for preferential separation.
(iv) Aniline can be used as froth enhancer.
Detailed Solution: Question 18
Which of the following reactions is an example for calcination process?
Detailed Solution: Question 19
Which one of the following statements is true about the froth flotation method?
Detailed Solution: Question 20
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